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After a long time hanging around, some organism might evolve that eats it though

Or a second industrial civilization would use it to power their cars...

Which happened for all fossils already and they are still there.

Fair point, although not all of them, and not all of those that do remain. If styrofoam ever starts rotting, maybe the styro-philes will eat 100% of each cup and poop out only completely normal organic matter. Nobody will ever find it!

Can we develope such a microorganism please?

Worms were discovered that eat styrofoam. There was a lot about it going on the news last summer[0].

0: https://www.scientificamerican.com/article/superworms-eat-an...

That is something, but apparently not quite what I want:

"Rinke and his colleagues are not suggesting that superworms should be released into landfills or polluted landscapes to munch through mountains of plastic"

Still all there compared to what quantity exactly? Ever hard of the gazillions of fossil fuels?

They still are there to detect them. The question was whether our fossil records would be detectable.

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